Repeat patient testing quality control (RPT-QC): Background and theory.

Area of Science:

• Clinical Chemistry
• Laboratory Medicine
• Quality Control

Background:

• Conventional statistical quality control (SQC) relies on stable, commercial control materials.
• This approach may not accurately reflect real-world testing conditions due to lot variability and lack of commutability.
• Repeat-patient testing quality control (RPT-QC) utilizes individual patient samples for quality assessment.

Purpose of the Study:

• To compare and contrast the principles and procedures of RPT-QC with conventional SQC.
• To provide an overview of RPT-QC control limit establishment.

Main Methods:

• Review of existing literature on RPT-QC and conventional SQC.
• Analysis of the theoretical advantages and practical challenges of each method.
• Discussion of control limit setting strategies for RPT-QC.

Main Results:

• RPT-QC offers improved commutability, lower costs, and quality control at clinically relevant concentrations.
• Patient samples in RPT-QC are exploited for their inherent variability under controlled storage.
• Challenges for RPT-QC include sample procurement and establishing appropriate control limits.

Conclusions:

• RPT-QC presents a viable alternative to conventional SQC, enhancing the accuracy and relevance of laboratory quality control.
• Further research into RPT-QC control limit establishment is warranted.
• RPT-QC can lead to more cost-effective and clinically meaningful quality assurance in diagnostic testing.